FreeBSD/Linux Kernel Cross Reference
sys/bsd/kern/bsd_init.c

     /*
      * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * The contents of this file constitute Original Code as defined in and
      * are subject to the Apple Public Source License Version 1.1 (the
      * "License").  You may not use this file except in compliance with the
      * License.  Please obtain a copy of the License at
     * http://www.apple.com/publicsource and read it before using this file.
     * 
     * This Original Code and all software distributed under the License are
     * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
     * License for the specific language governing rights and limitations
     * under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
     *      The Regents of the University of California.  All rights reserved.
     * (c) UNIX System Laboratories, Inc.
     * All or some portions of this file are derived from material licensed
     * to the University of California by American Telephone and Telegraph
     * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)init_main.c 8.16 (Berkeley) 5/14/95
     */
    
    /* 
     *
     * Mach Operating System
     * Copyright (c) 1987 Carnegie-Mellon University
     * All rights reserved.  The CMU software License Agreement specifies
     * the terms and conditions for use and redistribution.
     */
    
    #include <sys/param.h>
    #include <sys/filedesc.h>
    #include <sys/kernel.h>
    #include <sys/mount_internal.h>
    #include <sys/proc_internal.h>
    #include <sys/kauth.h>
    #include <sys/systm.h>
    #include <sys/vnode_internal.h>
    #include <sys/conf.h>
    #include <sys/buf_internal.h>
    #include <sys/clist.h>
    #include <sys/user.h>
    #include <sys/time.h>
    #include <sys/systm.h>
    #include <sys/mman.h>
    
    #include <bsm/audit_kernel.h>
    
    #include <sys/malloc.h>
    #include <sys/dkstat.h>
    
    #include <kern/startup.h>
    #include <kern/thread.h>
    #include <kern/task.h>
    #include <kern/ast.h>
    
    #include <mach/vm_param.h>
    
    #include <vm/vm_map.h>
    #include <vm/vm_kern.h>
   
   #include <sys/ux_exception.h>   /* for ux_exception_port */
   
   #include <sys/reboot.h>
   #include <mach/exception_types.h>
   #include <dev/busvar.h>                 /* for pseudo_inits */
   #include <sys/kdebug.h>
   
   #include <mach/mach_types.h>
   #include <mach/vm_prot.h>
   #include <mach/semaphore.h>
   #include <mach/sync_policy.h>
   #include <kern/clock.h>
   #include <mach/kern_return.h>
   
   #include <mach/shared_memory_server.h>
   #include <vm/vm_shared_memory_server.h>
   
   #include <net/init.h>
   
   extern int app_profile;         /* on/off switch for pre-heat cache */
   
   char    copyright[] =
   "Copyright (c) 1982, 1986, 1989, 1991, 1993\n\t"
   "The Regents of the University of California. "
   "All rights reserved.\n\n";
   
   extern void     ux_handler();
   
   /* Components of the first process -- never freed. */
   struct  proc proc0;
   struct  session session0;
   struct  pgrp pgrp0;
   struct  filedesc filedesc0;
   struct  plimit limit0;
   struct  pstats pstats0;
   struct  sigacts sigacts0;
   struct  proc *kernproc, *initproc;
   
   long tk_cancc;
   long tk_nin;
   long tk_nout;
   long tk_rawcc;
   
   int lock_trace = 0;
   /* Global variables to make pstat happy. We do swapping differently */
   int nswdev, nswap;
   int nswapmap;
   void *swapmap;
   struct swdevt swdevt[1];
   
   dev_t   rootdev;                /* device of the root */
   dev_t   dumpdev;                /* device to take dumps on */
   long    dumplo;                 /* offset into dumpdev */
   long    hostid;
   char    hostname[MAXHOSTNAMELEN];
   int             hostnamelen;
   char    domainname[MAXDOMNAMELEN];
   int             domainnamelen;
   char    classichandler[32] = {0};  
   uint32_t        classichandler_fsid = -1L;
   long    classichandler_fileid = -1L;
   
   char rootdevice[16];    /* hfs device names have at least 9 chars */
   
   #ifdef  KMEMSTATS
   struct  kmemstats kmemstats[M_LAST];
   #endif
   
   int     lbolt;                          /* awoken once a second */
   struct  vnode *rootvp;
   int boothowto = RB_DEBUG;
   
   #define BSD_PAGABLE_MAP_SIZE    (16 * 512 * 1024)
   vm_map_t        bsd_pageable_map;
   vm_map_t        mb_map;
   semaphore_t execve_semaphore;
   
   int     cmask = CMASK;
   
   int parse_bsd_args(void);
   extern int bsd_hardclockinit;
   extern task_t bsd_init_task;
   extern char    init_task_failure_data[];
   extern void time_zone_slock_init(void);
   static void process_name(char *, struct proc *);
   
   static void setconf(void);
   
   funnel_t *kernel_flock;
   
   extern void sysv_shm_lock_init(void);
   extern void sysv_sem_lock_init(void);
   extern void sysv_msg_lock_init(void);
   extern void pshm_lock_init();
   extern void psem_lock_init();
   
   /*
    * Initialization code.
    * Called from cold start routine as
    * soon as a stack and segmentation
    * have been established.
    * Functions:
    *      turn on clock
    *      hand craft 0th process
    *      call all initialization routines
    *  hand craft 1st user process
    */
   
   /*
    *      Sets the name for the given task.
    */
   static void
   process_name(s, p)
           char            *s;
           struct proc *p;
   {
           int             length = strlen(s);
   
           bcopy(s, p->p_comm,
                   length >= sizeof(p->p_comm) ? sizeof(p->p_comm) :
                           length + 1);
   }
   
   /* To allow these values to be patched, they're globals here */
   #include <machine/vmparam.h>
   struct rlimit vm_initial_limit_stack = { DFLSSIZ, MAXSSIZ };
   struct rlimit vm_initial_limit_data = { DFLDSIZ, MAXDSIZ };
   struct rlimit vm_initial_limit_core = { DFLCSIZ, MAXCSIZ };
   
   extern thread_t cloneproc(struct proc *, int);
   extern int      (*mountroot)(void);
   extern int      netboot_mountroot();    /* netboot.c */
   extern int      netboot_setup(struct proc * p);
   
   lck_grp_t * proc_lck_grp;
   lck_grp_attr_t * proc_lck_grp_attr;
   lck_attr_t * proc_lck_attr;
   
   /* hook called after root is mounted XXX temporary hack */
   void (*mountroot_post_hook)(void);
   
   /*
    * This function is called very early on in the Mach startup, from the
    * function start_kernel_threads() in osfmk/kern/startup.c.  It's called
    * in the context of the current (startup) task using a call to the
    * function kernel_thread_create() to jump into start_kernel_threads().
    * Internally, kernel_thread_create() calls thread_create_internal(),
    * which calls uthread_alloc().  The function of uthread_alloc() is
    * normally to allocate a uthread structure, and fill out the uu_sigmask,
    * uu_act, and uu_ucred fields.  It skips filling these out in the case
    * of the "task" being "kernel_task", because the order of operation is
    * inverted.  To account for that, we need to manually fill in at least
    * the uu_cred field so that the uthread structure can be used like any
    * other.
    */
   void
   bsd_init()
   {
           register struct proc *p;
           struct uthread *ut;
           extern kauth_cred_t rootcred;
           register int i;
           int s;
           thread_t        th;
           struct vfs_context context;
           void            lightning_bolt(void );
           kern_return_t   ret;
           boolean_t funnel_state;
           struct ucred temp_cred;
           extern void file_lock_init(void);
   
           kernel_flock = funnel_alloc(KERNEL_FUNNEL);
           if (kernel_flock == (funnel_t *)0 ) {
                   panic("bsd_init: Failed to allocate kernel funnel");
           }
           
           funnel_state = thread_funnel_set(kernel_flock, TRUE);
   
           printf(copyright);
           
           kmeminit();
           
           parse_bsd_args();
   
           /* Initialize the uthread zone */
           //uthread_zone_init();  /* XXX redundant: previous uthread_alloc() */
   
           /* Initialize kauth subsystem before instancing the first credential */
           kauth_init();
   
           /* Initialize process and pgrp structures. */
           procinit();
   
           kernproc = &proc0;
   
           p = kernproc;
   
           /* kernel_task->proc = kernproc; */
           set_bsdtask_info(kernel_task,(void *)p);
           p->p_pid = 0;
   
           /* give kernproc a name */
           process_name("kernel_task", p);
   
   
           /* allocate proc lock group attribute and group */
           proc_lck_grp_attr= lck_grp_attr_alloc_init();
           lck_grp_attr_setstat(proc_lck_grp_attr);
   
           proc_lck_grp = lck_grp_alloc_init("proc",  proc_lck_grp_attr);
   
   
           /* Allocate proc lock attribute */
           proc_lck_attr = lck_attr_alloc_init();
           //lck_attr_setdebug(proc_lck_attr);
   
           lck_mtx_init(&p->p_mlock, proc_lck_grp, proc_lck_attr);
           lck_mtx_init(&p->p_fdmlock, proc_lck_grp, proc_lck_attr);
   
           if (current_task() != kernel_task)
                   printf("bsd_init: We have a problem, "
                                   "current task is not kernel task\n");
           
           ut = (uthread_t)get_bsdthread_info(current_thread());
   
           /*
            * Create process 0.
            */
           LIST_INSERT_HEAD(&allproc, p, p_list);
           p->p_pgrp = &pgrp0;
           LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
           LIST_INIT(&pgrp0.pg_members);
           LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
   
           pgrp0.pg_session = &session0;
           session0.s_count = 1;
           session0.s_leader = p;
   
           p->task = kernel_task;
           
           p->p_stat = SRUN;
           p->p_flag = P_SYSTEM;
           p->p_nice = NZERO;
           p->p_pptr = p;
           lockinit(&p->signal_lock, PVM, "signal", 0, 0);
           TAILQ_INIT(&p->p_uthlist);
           p->sigwait = FALSE;
           p->sigwait_thread = THREAD_NULL;
           p->exit_thread = THREAD_NULL;
   
           /*
            * Create credential.  This also Initializes the audit information.
            * XXX It is not clear what the initial values should be for audit ID,
            * XXX session ID, etc..
            */
           bzero(&temp_cred, sizeof(temp_cred));
           temp_cred.cr_ngroups = 1;
   
           p->p_ucred = kauth_cred_create(&temp_cred); 
   
           /* give the (already exisiting) initial thread a reference on it */
           kauth_cred_ref(p->p_ucred);
           ut->uu_ucred = p->p_ucred;
           
           TAILQ_INIT(&p->aio_activeq);
           TAILQ_INIT(&p->aio_doneq);
           p->aio_active_count = 0;
           p->aio_done_count = 0;
   
           file_lock_init();
   
           /* Create the file descriptor table. */
           filedesc0.fd_refcnt = 1+1;      /* +1 so shutdown will not _FREE_ZONE */
           p->p_fd = &filedesc0;
           filedesc0.fd_cmask = cmask;
           filedesc0.fd_knlistsize = -1;
           filedesc0.fd_knlist = NULL;
           filedesc0.fd_knhash = NULL;
           filedesc0.fd_knhashmask = 0;
   
           /* Create the limits structures. */
           p->p_limit = &limit0;
           for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++)
                   limit0.pl_rlimit[i].rlim_cur = 
                           limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY;
           limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE;
           limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC;
           limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
           limit0.pl_rlimit[RLIMIT_STACK] = vm_initial_limit_stack;
           limit0.pl_rlimit[RLIMIT_DATA] = vm_initial_limit_data;
           limit0.pl_rlimit[RLIMIT_CORE] = vm_initial_limit_core;
           limit0.p_refcnt = 1;
   
           p->p_stats = &pstats0;
           p->p_sigacts = &sigacts0;
   
           /*
            * Charge root for two  processes: init and mach_init.
            */
           (void)chgproccnt(0, 1);
   
           /*
            *      Allocate a kernel submap for pageable memory
            *      for temporary copying (execve()).
            */
           {
                   vm_offset_t     min;
   
                   ret = kmem_suballoc(kernel_map,
                                   &min,
                                   (vm_size_t)BSD_PAGABLE_MAP_SIZE,
                                   TRUE,
                                   VM_FLAGS_ANYWHERE,
                                   &bsd_pageable_map);
                   if (ret != KERN_SUCCESS) 
                           panic("bsd_init: Failed to allocate bsd pageable map");
           }
   
           /*
            * Initialize buffers and hash links for buffers
            *
            * SIDE EFFECT: Starts a thread for bcleanbuf_thread(), so must
            *              happen after a credential has been associated with
            *              the kernel task.
            */
           bsd_bufferinit();
   
           /* Initialize the execve() semaphore */
           ret = semaphore_create(kernel_task, &execve_semaphore,
                           SYNC_POLICY_FIFO, (BSD_PAGABLE_MAP_SIZE / NCARGS));
           if (ret != KERN_SUCCESS)
                   panic("bsd_init: Failed to create execve semaphore");
   
           /*
            * Initialize the calendar.
            */
           IOKitResetTime();
   
           ubc_init();
   
           /* Initialize the file systems. */
           vfsinit();
   
           /* Initialize mbuf's. */
           mbinit();
   
           /*
            * Initializes security event auditing.
            * XXX: Should/could this occur later?
            */
           audit_init();  
   
           /* Initialize kqueues */
           knote_init();
   
           /* Initialize for async IO */
           aio_init();
   
           /* Initialize pipes */
           pipeinit();
   
           /* Initialize SysV shm subsystem locks; the subsystem proper is
            * initialized through a sysctl.
            */
           sysv_shm_lock_init();
           sysv_sem_lock_init();
           sysv_msg_lock_init();
           pshm_lock_init();
           psem_lock_init();
   
           /* POSIX Shm and Sem */
           pshm_cache_init();
           psem_cache_init();
           time_zone_slock_init();
   
           /*
            * Initialize protocols.  Block reception of incoming packets
            * until everything is ready.
            */
           sysctl_register_fixed(); 
           sysctl_mib_init();
           dlil_init();
           proto_kpi_init();
           socketinit();
           domaininit();
   
           p->p_fd->fd_cdir = NULL;
           p->p_fd->fd_rdir = NULL;
   
   #ifdef GPROF
           /* Initialize kernel profiling. */
           kmstartup();
   #endif
   
           /* kick off timeout driven events by calling first time */
           thread_wakeup(&lbolt);
           timeout((void (*)(void *))lightning_bolt, 0, hz);
   
           bsd_autoconf();
   
           /*
            * We attach the loopback interface *way* down here to ensure
            * it happens after autoconf(), otherwise it becomes the
            * "primary" interface.
            */
   #include <loop.h>
   #if NLOOP > 0
           loopattach();                   /* XXX */
   #endif
           
           /* Register the built-in dlil ethernet interface family */
           ether_family_init();
   
           /* Call any kext code that wants to run just after network init */
           net_init_run();
   
           vnode_pager_bootstrap();
   #if 0
           /* XXX Hack for early debug stop */
           printf("\nabout to sleep for 10 seconds\n");
           IOSleep( 10 * 1000 );
           /* Debugger("hello"); */
   #endif
   
           inittodr(0);
   
           /* Mount the root file system. */
           while( TRUE) {
                   int err;
   
                   setconf();
                   bsd_hardclockinit = -1; /* start ticking */
   
                   if (0 == (err = vfs_mountroot()))
                           break;
   #if NFSCLIENT
                   if (mountroot == netboot_mountroot) {
                           printf("cannot mount network root, errno = %d\n", err);
                           mountroot = NULL;
                           if (0 == (err = vfs_mountroot()))
                                   break;
                   }
   #endif
                   printf("cannot mount root, errno = %d\n", err);
                   boothowto |= RB_ASKNAME;
           }
   
           context.vc_proc = p;
           context.vc_ucred = p->p_ucred;
           mountlist.tqh_first->mnt_flag |= MNT_ROOTFS;
   
           /* Get the vnode for '/'.  Set fdp->fd_fd.fd_cdir to reference it. */
           if (VFS_ROOT(mountlist.tqh_first, &rootvnode, &context))
                   panic("bsd_init: cannot find root vnode");
           rootvnode->v_flag |= VROOT;
           (void)vnode_ref(rootvnode);
           (void)vnode_put(rootvnode);
           filedesc0.fd_cdir = rootvnode;
   
   #if NFSCLIENT
           if (mountroot == netboot_mountroot) {
                   int err;
                   /* post mount setup */
                   if (err = netboot_setup(p)) {
                           panic("bsd_init: NetBoot could not find root, %d", err);
                   }
           }
   #endif
           
   
           microtime(&p->p_stats->p_start);
           p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0;
   
   #if DEVFS
           {
               extern void devfs_kernel_mount(char * str);
               
               devfs_kernel_mount("/dev");
           }
   #endif /* DEVFS */
           
           /* Initialize signal state for process 0. */
           siginit(p);
   
           bsd_utaskbootstrap();
   
           /* invoke post-root-mount hook */
           if (mountroot_post_hook != NULL)
                   mountroot_post_hook();
           
           (void) thread_funnel_set(kernel_flock, funnel_state);
   }
   
   /* Called with kernel funnel held */
   void
   bsdinit_task(void)
   {
           struct proc *p = current_proc();
           struct uthread *ut;
           kern_return_t   kr;
           thread_t th_act;
           shared_region_mapping_t system_region;
   
           process_name("init", p);
   
           ux_handler_init();
   
           th_act = current_thread();
           (void) host_set_exception_ports(host_priv_self(),
                                           EXC_MASK_ALL & ~(EXC_MASK_SYSCALL |
                                                            EXC_MASK_MACH_SYSCALL |
                                                            EXC_MASK_RPC_ALERT),
                                           ux_exception_port,
                                           EXCEPTION_DEFAULT, 0);
   
           (void) task_set_exception_ports(get_threadtask(th_act),
                                           EXC_MASK_ALL & ~(EXC_MASK_SYSCALL |
                                                            EXC_MASK_MACH_SYSCALL |
                                                            EXC_MASK_RPC_ALERT),
                                           ux_exception_port,
                                           EXCEPTION_DEFAULT, 0);
   
   
   
   
           ut = (uthread_t)get_bsdthread_info(th_act);
           ut->uu_ar0 = (void *)get_user_regs(th_act);
   
           bsd_hardclockinit = 1;  /* Start bsd hardclock */
           bsd_init_task = get_threadtask(th_act);
           init_task_failure_data[0] = 0;
           system_region = lookup_default_shared_region(ENV_DEFAULT_ROOT, cpu_type());
           if (system_region == NULL) {
                   shared_file_boot_time_init(ENV_DEFAULT_ROOT, cpu_type());
           } else {
                   vm_set_shared_region(get_threadtask(th_act), system_region);
           }
           load_init_program(p);
           /* turn on app-profiling i.e. pre-heating */
           app_profile = 1;
           lock_trace = 1;
   }
   
   void
   lightning_bolt()
   {                       
           boolean_t       funnel_state;
           extern void klogwakeup(void);
   
           funnel_state = thread_funnel_set(kernel_flock, TRUE);
   
           thread_wakeup(&lbolt);
           timeout(lightning_bolt,0,hz);
           klogwakeup();
   
           (void) thread_funnel_set(kernel_flock, FALSE);
   }
   
   bsd_autoconf()
   {
           extern kern_return_t IOKitBSDInit( void );
   
           kminit();
   
           /* 
            * Early startup for bsd pseudodevices.
            */
           {
               struct pseudo_init *pi;
           
               for (pi = pseudo_inits; pi->ps_func; pi++)
                   (*pi->ps_func) (pi->ps_count);
           }
   
           return( IOKitBSDInit());
   }
   
   
   #include <sys/disklabel.h>  /* for MAXPARTITIONS */
   
   static void
   setconf(void)
   {       
           extern kern_return_t IOFindBSDRoot( char * rootName,
                                   dev_t * root, u_int32_t * flags );
           u_int32_t       flags;
           kern_return_t   err;
   
           /*
            * calls into IOKit can generate networking registrations
            * which needs to be under network funnel. Right thing to do
            * here is to drop the funnel alltogether and regrab it afterwards
            */
           thread_funnel_set(kernel_flock, FALSE);
           err = IOFindBSDRoot( rootdevice, &rootdev, &flags );
           thread_funnel_set(kernel_flock, TRUE);
           if( err) {
                   printf("setconf: IOFindBSDRoot returned an error (%d);"
                           "setting rootdevice to 'sd0a'.\n", err); /* XXX DEBUG TEMP */
                   rootdev = makedev( 6, 0 );
                   strcpy( rootdevice, "sd0a" );
                   flags = 0;
           }
   
   #if NFSCLIENT
           if( flags & 1 ) {
                   /* network device */
                   mountroot = netboot_mountroot;
           } else {
   #endif
                   /* otherwise have vfs determine root filesystem */
                   mountroot = NULL;
   #if NFSCLIENT
           }
   #endif
   
   }
   
   bsd_utaskbootstrap()
   {
           thread_t th_act;
           struct uthread *ut;
   
           th_act = cloneproc(kernproc, 0);
           initproc = pfind(1);                            
           /* Set the launch time for init */
           microtime(&initproc->p_stats->p_start);
   
           ut = (struct uthread *)get_bsdthread_info(th_act);
           ut->uu_sigmask = 0;
           act_set_astbsd(th_act);
           (void) thread_resume(th_act);
   }
   
   parse_bsd_args()
   {
           extern char init_args[];
           char    namep[16];
           extern int boothowto;
           extern int srv;
           extern int ncl;
   
           int len;
   
           if (PE_parse_boot_arg("-s", namep)) {
                   boothowto |= RB_SINGLE;
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -s");
                   else
                           strcat(init_args,"-s");
           }
   
           if (PE_parse_boot_arg("-b", namep)) {
                   boothowto |= RB_NOBOOTRC;
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -b");
                   else
                           strcat(init_args,"-b");
           }
   
           if (PE_parse_boot_arg("-F", namep)) {
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -F");
                   else
                           strcat(init_args,"-F");
           }
   
           if (PE_parse_boot_arg("-v", namep)) {
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -v");
                   else
                           strcat(init_args,"-v");
           }
   
           if (PE_parse_boot_arg("-x", namep)) { /* safe boot */
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -x");
                   else
                           strcat(init_args,"-x");
           }
   
           if (PE_parse_boot_arg("-d", namep)) {
                   len = strlen(init_args);
                   if(len != 0)
                           strcat(init_args," -d");
                   else
                           strcat(init_args,"-d");
           }
   
           PE_parse_boot_arg("srv", &srv);
           PE_parse_boot_arg("ncl", &ncl);
           PE_parse_boot_arg("nbuf", &nbuf);
   
           return 0;
   }
   
   #if !NFSCLIENT
   int 
   netboot_root(void)
   {
           return(0);
   }
   #endif

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